cycle tracking please help.

Allyssa
So, I am nothing new to be pregnant. I have a 20 month old and a 6 month old. YIKES lol. My cycle has been very irregular.. I recently had an IUD removed due to complications with my ovaries & reaction to the hormones. I had my period regularly when I had the IUD. Never missed one. Well I started my period October 1st... then again on October 21st... had my IUD removed November 1st and didn't start my period until November 28th... 
so my question is .. on the app it said my fertile days were the 9-13... I had unprotected sex the 11th and 12th... basically with my periods going crazy lately due to what I'm going to guess was a change in my hormone levels... 
WHAT ARE THE CHANCES I MAY BE PREGNANT? Like how accurate do you think that could be due to the ups and downs of my menstral?? Like I've been pretty good about timing it and avoiding my fertile week. I've done MULTIPLE ovulation calculators & also on my days calander (another app) it all said the same thing with my past cycle history. Should I test and how soon can I test since my periods have been crazy any ways??? I have 2 BABIES and I'm just freaking out because I'm usually an expert at this 😫😫😫😫